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  • EEVblog #526 – Bank Note Acceptor Followup

    Posted on September 26th, 2013 EEVblog 4 comments

    A quick followup to Bank Note Validator Teardown, to clarify the LEDs used.

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    • Worf

      Actually, camera sensors are VERY sensitive to IR. So much so that they usually have to put on an IR blocking filter in the light path to prevent IR from screwing up the image.

      This filter doesn’t render the sensor completely IR blocking, but it attenuates the IR significantly.

    • moose

      “regular” paper will glow blue under UV, banknote paper wont, the same with the IR ( the inks are very specific to banknotes)

    • Jason

      Soon we will new US bills in circulation (Oct 8) with more security features (ie 3D security ribbon). $1 are only bills left without any changes over the last 10 years. Too bad that you only have $5 bills to test.

    • Fred Lotte

      The angled sensors are probably looking at reflected light.